440
FNCA52 TJSJ 180730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST THU JUN 18 2026
DISCUSSION
ALTHOUGH A WEAK TROPICAL WAVE WILL MOVE ACROSS THE ISLANDS TODAY,
KEEPING RH VALUES ABOVE CRITICAL LEVELS, THE EXTENSIVE DRY SOILS
AND HOT DAYTIME TEMPERATURES WILL COMBINE WITH SUSTAINED WINDS OF
10 TO 21 MPH WITH STRONGER GUSTS TO MAINTAIN AN ELEVATED FIRE
WEATHER RISK THROUGH LATE THIS AFTERNOON.
PRZ014-182000-
SOUTHEAST COASTAL PLAINS-
330 AM AST THU JUN 18 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 20 20
TEMP (24H TREND) 93 (+3) 74 (-2) 92
RH % (24H TREND) 45 (-7) 89 (+9) 47
WIND 20FT/EARLY(MPH) E 16 E 16 E 17
WIND 20FT/LATE(MPH) E 18 E 13 E 17
MIXING HGT(FT-AGL/MSL)5470 5610
TRANSPORT WND (MPH) E 17 E 22
VENT RATE (KT-FT) 82050 106590
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-182000-
SOUTHERN HILLS-
330 AM AST THU JUN 18 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 10 30
TEMP (24H TREND) 89 (+4) 70 (-3) 89
RH % (24H TREND) 54 (-8) 97 (+10) 58
WIND 20FT/EARLY(MPH) E 12 E 13 E 13
WIND 20FT/LATE(MPH) E 13 E 13 E 14
MIXING HGT(FT-AGL/MSL)6230 6270
TRANSPORT WND (MPH) E 15 E 21
VENT RATE (KT-FT) 80990 112860
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-182000-
NORTH COASTAL PLAINS-
330 AM AST THU JUN 18 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 70 40 40
TEMP (24H TREND) 91 (+2) 73 (-2) 91
RH % (24H TREND) 58 (-5) 97 (+10) 60
WIND 20FT/EARLY(MPH) E 14 E 18 E 14
WIND 20FT/LATE(MPH) E 21 E 12 E 20
MIXING HGT(FT-AGL/MSL)5350 5920
TRANSPORT WND (MPH) E 14 E 20
VENT RATE (KT-FT) 64200 100640
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-182000-
NORTHERN HILLS-
330 AM AST THU JUN 18 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 70 40 40
TEMP (24H TREND) 90 (+2) 71 (-2) 90
RH % (24H TREND) 58 (-3) 98 (+8) 61
WIND 20FT/EARLY(MPH) E 12 E 14 E 13
WIND 20FT/LATE(MPH) E 17 E 9 E 18
MIXING HGT(FT-AGL/MSL)6480 7260
TRANSPORT WND (MPH) E 12 E 17
VENT RATE (KT-FT) 64800 108900
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-182000-
WEST COAST-
330 AM AST THU JUN 18 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 80 40 80
TEMP (24H TREND) 93 (+2) 73 (-1) 93
RH % (24H TREND) 54 (-6) 96 (+7) 58
WIND 20FT/EARLY(MPH) E 12 E 12 E 16
WIND 20FT/LATE(MPH) E 13 E 10 SE 17
MIXING HGT(FT-AGL/MSL)5220 5230
TRANSPORT WND (MPH) E 9 E 15
VENT RATE (KT-FT) 41760 67990
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-182000-
EASTERN INTERIOR-
330 AM AST THU JUN 18 2026
TODAY TONIGHT FRI
CLOUD COVER MCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 80 50 40
TEMP (24H TREND) 89 (+3) 71 (-4) 89
RH % (24H TREND) 58 (-4) 99 (+11) 61
WIND 20FT/EARLY(MPH) E 11 E 14 E 14
WIND 20FT/LATE(MPH) E 13 E 14 E 14
MIXING HGT(FT-AGL/MSL)6880 6740
TRANSPORT WND (MPH) E 16 E 21
VENT RATE (KT-FT) 96320 121320
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-182000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST THU JUN 18 2026
TODAY TONIGHT FRI
CLOUD COVER MCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 80 60 40
TEMP (24H TREND) 85 (+4) 70 (-3) 85
RH % (24H TREND) 66 (-5) 100 (+11) 68
WIND 20FT/EARLY(MPH) E 11 E 11 E 12
WIND 20FT/LATE(MPH) E 12 E 12 E 13
MIXING HGT(FT-AGL/MSL)4830 5270
TRANSPORT WND (MPH) E 16 E 22
VENT RATE (KT-FT) 67620 100130
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-182000-
CENTRAL MOUNTAIN RANGE-
330 AM AST THU JUN 18 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 80 30 70
TEMP (24H TREND) 88 (+4) 68 (-2) 88
RH % (24H TREND) 56 (-8) 97 (+7) 61
WIND 20FT/EARLY(MPH) E 9 E 9 E 11
WIND 20FT/LATE(MPH) E 11 E 8 E 11
MIXING HGT(FT-AGL/MSL)8200 7860
TRANSPORT WND (MPH) E 8 E 15
VENT RATE (KT-FT) 57400 102180
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-182000-
CAYEY MOUNTAIN RANGE-
330 AM AST THU JUN 18 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 50 40
TEMP (24H TREND) 85 (+3) 70 (-2) 84
RH % (24H TREND) 63 (-4) 100 (+7) 67
WIND 20FT/EARLY(MPH) E 11 E 11 E 12
WIND 20FT/LATE(MPH) E 12 E 11 E 12
MIXING HGT(FT-AGL/MSL)5580 5750
TRANSPORT WND (MPH) E 17 E 21
VENT RATE (KT-FT) 83700 103500
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-182000-
VIEQUES-
330 AM AST THU JUN 18 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 40
TEMP (24H TREND) 88 (0) 76 (-3) 88
RH % (24H TREND) 62 (+1) 92 (+12) 61
WIND 20FT/EARLY(MPH) E 14 E 18 E 17
WIND 20FT/LATE(MPH) E 16 E 18 E 16
MIXING HGT(FT-AGL/MSL)3390 3380
TRANSPORT WND (MPH) E 17 E 22
VENT RATE (KT-FT) 50850 64220
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-182000-
CULEBRA-
330 AM AST THU JUN 18 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 30 40
TEMP (24H TREND) 90 (+1) 77 (-2) 90
RH % (24H TREND) 59 (-5) 93 (+12) 59
WIND 20FT/EARLY(MPH) E 13 E 18 E 17
WIND 20FT/LATE(MPH) E 16 E 18 E 14
MIXING HGT(FT-AGL/MSL)3270 3390
TRANSPORT WND (MPH) E 17 E 22
VENT RATE (KT-FT) 49050 64410
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-182000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST THU JUN 18 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 30 20
TEMP (24H TREND) 93 (+3) 74 (-3) 93
RH % (24H TREND) 46 (-7) 88 (+9) 46
WIND 20FT/EARLY(MPH) E 17 E 18 E 21
WIND 20FT/LATE(MPH) E 18 E 14 SE 23
MIXING HGT(FT-AGL/MSL)5100 5470
TRANSPORT WND (MPH) E 16 E 24
VENT RATE (KT-FT) 71400 114870
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-182000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST THU JUN 18 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 20 40
TEMP (24H TREND) 87 (+1) 77 (-1) 87
RH % (24H TREND) 66 (+1) 93 (+9) 64
WIND 20FT/EARLY(MPH) E 13 E 18 E 17
WIND 20FT/LATE(MPH) E 16 E 18 E 16
MIXING HGT(FT-AGL/MSL)3230 3370
TRANSPORT WND (MPH) E 17 E 20
VENT RATE (KT-FT) 48450 57290
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-182000-
ST CROIX-
330 AM AST THU JUN 18 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 30 30
TEMP (24H TREND) 88 (0) 76 (-3) 88
RH % (24H TREND) 66 (+4) 93 (+9) 65
WIND 20FT/EARLY(MPH) E 14 E 19 E 17
WIND 20FT/LATE(MPH) E 16 E 18 E 16
MIXING HGT(FT-AGL/MSL)4580 5260
TRANSPORT WND (MPH) E 20 E 24
VENT RATE (KT-FT) 77860 110460
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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